There was a massive poster of me down my road, right outside the chip shop. I was about to go in, but then I saw it and changed my mind. Me coming out with a bag of chips, while I'm up there doing crunches on the poster... well, it would not look good.
Faith makes all evil good to us, and all good better; unbelief makes all good evil, and all evil worse. Faith laughs at the shaking of the spear; unbelief trembles at the shaking of a leaf.